Metal-protected high-potential insulator.



B. GATI.

METAL PROTECTED HIGH POTENTIAL INSULATOPL' APPLICATION nuzo JULY 22.1915.

1,277,304. Patented Aug. 27, 1918.

51w U452 flit MIMI/ W UNITED STATES PATENT omen.

I L or 31mm, moan.

Patented Aug. 27, 1918.

Application filed July 38, 191d. Serial No. 41,398.

To all whom it may concern.-

Be it known that I,-Bi:na G111, a sub ect of the King of Hungary, residing in Budapest, Hungary, consultln technician, have invented certain new an useful Improvements in Metal-Protected High-Potential Insulators, of which the following is a specification.

The subject matter of the present invention relates to a modification of the wellknown metal case insulators for high potential currents in which the metal casing covering the insulation body projects beyond the insulation body and the surface of the same not covered by the metal casing is formed in accordance with the principles of electrostatic strain.

In Figure 1 of the accompanying drawing there is illustrated one of these well known insulators in vertical section, while Fig. 2 represents other embodiments of the subject matter of the invention.

In all the figures the metal casing projecting over the insulating material 2 is designated by 1, the connecting grooves by 3 and the support by 4.

The insulating material 2 can conslst of porcelain, glass, or any other desired suit able insulatin material, but especially of rubber or har rubber, and the free surface of the same between the casing and the support is developed aecordin to the principles of electrostatic strain. e generatrix of said surface is shaped in such a way that it is per endicular to the successive longitudma sections of the insulator body between the metal casing and sup ort. Said longitudinal sections are cone aped surfaces situated within each other whose generatrices in their ensemble represent a beam of rays between the metal and support. In the practical form, however, not only the edges, but a portion of the outer and inner halves of the free surfaces of-the insulator bod may be constructed as a cone-shaped sur ace perpendicular to the metal casing or support, and the middle portion only maybe a convex surface without any great deviation of the free insulating surface from the electrostatic principle being caused thereby. The theoretical or the above mentioned practical form of the free surface of the insula-.

. tor body corresponding to the electrostatic principle has, however, the disadvantage that it does not afford suflicient protection against the unfavorable influence of moisand outer halves of the free surface of the insulatin body, while preserving as far as possible t e form corres ending to the electrostatic principle, are placed from each other in a vertical direction and connected with each other by a vertical or almost vertical surface.

The free surface of the insulatin body represents, therefore, no longer a sur ace deviating only a little from the horizontal, but a form after the manner of a reverse curved surface, the approximately horizontal portions of which are shaped in accordance with the principle of electrostatic strain while the portion near the point of inflection forms a surface affording an effective protection against the unfavorable influence of the moisture and of the deposited dirt. As regards the approximately vertical part a deviation is made, it is true, from the electrostatic princi 1e, but on the one hand concentration o the electric potential is roduced thereby only on a small, interme 'ate point which lies in a zone in which the distance between the metal casing and the support is much greater than in the upper portion of the insulating body, and the fall of potential is unimportant; and on the other and, the disadvantage caused by this slight deviation from the principle of electrostatic strain is advantageously balanced on account of the better protection against the moisture of the air.

In accordance with Fig. 1 the middle connecting surface is shaped concave, whereby there is produced an almost vertical diverting surface for the deposited moisture, while in accordance with Fig. 2 the halves of the free surface perpendicular to the metal casing and the support are connected with each other by a vertical surface 5, which also, is advantageous to avoid 'difliculty with the soot'and dirt layers which endanger the insulating capacity.

I claim as my invention:

1. An improved insulator for high fre quency or high potential currents, comprising an insulatin body and a metal casing coverin a portion of the said insulating body, t e exposed portions of the surface of the said body having the form of a curved surface, whose outwardly extending portions are formed in accordance with the electrostatic strains, while the portions lying in the region of the inflection are disposed substantially vertical.

2. An improved insulator for high frequency or high potential currents, comprising an insulatin body and a metal casing covering a portlon of the said insulating body, the exposed portions of the surface of the said body having the form of a reverse curved surface, whose outwardly extending portions are formed in accordance with the electrostatic strains, while the portions lying in the region of the inflection are disposed substantially vertical.

In witness whereof, I have hereunto signed my name in thepresence of two subscribing witnesses.

BELA GIXTI. WVitnesses:

SIcnUNn JERNAUER, lluon KEMEXY. 

